package com.xbfinal.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.xbfinal.reggie.common.CustomException;
import com.xbfinal.reggie.mapper.CategoryMapper;
import com.xbfinal.reggie.pojo.Category;
import com.xbfinal.reggie.pojo.Dish;
import com.xbfinal.reggie.pojo.Setmeal;
import com.xbfinal.reggie.service.CategoryService;
import com.xbfinal.reggie.service.DishService;
import com.xbfinal.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @autor 笑霸fianl~
 * 欢迎访问GitHub：https://github.com/XBfinal
 * 欢迎访问Gitee：https://gitee.com/XBfianl
 * 欢迎访问CSDN：https://blog.csdn.net/weixin_52062043
 */
@Service
public class CategoryServiceImpl
        extends ServiceImpl<CategoryMapper, Category>
        implements CategoryService {

    @Autowired
    private DishService dishService;

    @Autowired
    SetmealService setmealService;
    /**
     * 根据id删除分类，删除之前需要进行判断
     * @param id
     */
    //扩展自己的方法
    public  void remove(Long id){
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper=
                new LambdaQueryWrapper<>();
        //添加查询条件，根据分类id进行查询
        dishLambdaQueryWrapper.eq(Dish::getCategoryId,id);//(等值查询)
        final int count1
                = dishService.count(dishLambdaQueryWrapper);

        //查询当前分类是否关联了菜品，如果关联就抛出异常
        if(count1>0){
            //已经关联了菜品,抛出一个异常
            throw new CustomException("关联了菜品，不能删除");
        }
        LambdaQueryWrapper<Setmeal> SetmealLambdaQueryWrapper=
                new LambdaQueryWrapper<>();
        SetmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,id);
        final int count2
                = setmealService.count(SetmealLambdaQueryWrapper);
        //查询当前分类是否关联了套餐，如果关联就抛出异常
        if(count2>0){
            //已经关联了套餐,抛出一个异常
            throw new CustomException("关联了套餐，不能删除");
        }
        //正常删除
        super.removeById(id);
    }
}
